Influence of polysiloxane as nanofiller on the surface, optical and thermal properties of guar gum grafted polyaniline matrix
| Autor: | Ajay K. Mishra, J.P. Mofokeng, S.C. Mojaki, S. Bhardwaj Mishra |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Siloxanes Nanofibers 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Galactans Nanocomposites Mannans chemistry.chemical_compound Structural Biology Specific surface area Polyaniline Plant Gums Fourier transform infrared spectroscopy Molecular Biology Sol-gel Nanocomposite Guar gum Aniline Compounds General Medicine Mesoporous silica 021001 nanoscience & nanotechnology Silicon Dioxide 0104 chemical sciences Amorphous solid Chemical engineering chemistry 0210 nano-technology Porosity |
| Zdroj: | International journal of biological macromolecules. 114 |
| ISSN: | 1879-0003 |
| Popis: | Mesoporous silica containing nanocomposites of in situ polymerised aniline grafted on guar gum (GG), were synthesised by sol-gel technique. Characterization of samples with respect to SEM, TEM, XRD, XPS, FTIR, BET, UV-vis, and PL illustrated the optically active materials with diverse morphologies. Microscopic analysis rendered transitional changes from smooth GG to coated PANI grafts and dense clusters of polysiloxane nanocomposites. FTIR analysis confirmed the interaction of GG-PANI-Si components. XRD diffractograms illustrate tremendous reduction of dominant amorphous phase of GG by grafted HCl doped PANI depicted by characteristic peaks (centred at 2θ=~25° and 2θ=~20.0°) in the partially crystalline and amorphous GG-g-PANI and GG-g-PANI-Si1 nanocomposites. Phase modification through PANI grafting showed specific surface area of GG-g-PANI (7.6m2/g) improving immensely with low polysiloxane contents to ~170.6m2/g in GG-g-PANI-Si1 compared to 25.6m2/g of GG-g-PANI-Si2. The nanocomposites were thermally stable up to ~240°C, each leaving 69% (GG-g-PANI-Si1) and ~77% (GG-g-PANI-Si2) of inorganic residues. Both showed no thermal dedoping, suggesting the good thermal protection offered by polysiloxane layer. |
| Databáze: | OpenAIRE |
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